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Document DMAgic line mode improvements (Core PR #887) #667

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@MassiveBattlebotsFan

PR MEGA65/mega65-core#887 adds the following:

  • Bit 4 of extended options $8F/$9F enables scaling in line mode for their respective pointers.
  • If line mode scaling is enabled, line mode treats skip rate (extended option $82-$85) as a single 16-bit fractional value for each pointer, with $0000 equivalent to one pixel per cycle (unscaled).
  • Line mode now supports screens in a row configuration instead of column.
  • Line mode can now be reversed via the direction bits, which allows lines to draw from one arbitrary point to another.

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